Method for Transmitting and Receiving Uplink Sounding Reference Signal, Base Station and Mobile Terminal

Abstract

The field of wireless communications is related, especially the technique of transmitting uplink sounding reference signal (SRS) by a mobile terminal with multiple transmission antennas is related. A method for receiving uplink sounding reference signal includes the following steps: receiving the SRS signals, which are respectively transmitted from respective radio frequency transmission modules of the mobile terminal according to the respectively allocated Transmission Comb (TC) values and Cyclic Shift (CS) values when the transmission period arrives, wherein TC values and / or CS values allocated for any two radio frequency transmission modules are different; determining the radio frequency transmission module corresponding to every received SRS signal according to the TC values and CS values respectively allocated for respective radio frequency transmission modules. A device for receiving uplink sounding reference signal, a method and a device for transmitting uplink sounding reference signal are also provided. Because different TC values and / or different CS values are allocated for respective radio frequency transmission modules, (multiple) radio frequency transmission modules can transmit SRS signals through (multiple) transmission antennas during the same transmission period by way of Frequency Division Multiplex (FDM) or Code Division Multiplex (CDM).

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]The present application is a US National Stage of International Application No. PCT / CN2009 / 000683, filed 19 Jun. 2009, designating the United States, and claiming priority to Chinese Patent Application No. 200810115312.1 filed 20 Jun. 2008.FIELD OF THE INVENTION[0002]The present invention relates to the field of wireless communication and particularly to a technology for transmitting uplink sounding reference signals by a mobile terminal with multiple transmission antennas.BACKGROUND OF THE INVENTION[0003]An uplink Sounding Reference Signal (SRS) is an uplink signal transmitted from a mobile terminal, and a base station performs operations of uplink timing detection, power control, uplink scheduling in the frequency domain, link adaptation, etc., according to uplink channel status information provided in the SRS upon reception of the SRS. For a Time Division Duplex (TDD) system, when Multiple Input Multiple Output (MIMO) transmission base...

AI Technical Summary

Benefits of technology

[0019]Embodiments of the invention provide a method for transmitting uplink sounding reference signals and a mobile terminal, so that multiple radio frequency transmission modules of the mobile terminal can transmit uplink sounding reference signals over multiple transmission antennas in the same transmission cycle.

[0032]Since the radio frequency transmission modules of the mobile terminal are assigned with different TC values and / or different CS values in the embodiments of the invention, the radio frequency transmission modules can transmit the SRSs over the multiple transmission antennas through FDM or CDM in the same transmission cycle according to the respective TC values and CS values assigned for the radio frequency transmission modules, so that the base station can derive more accurate uplink channel status information and perform more accurate channel estimation.

Problems solved by technology

Since an SRS is transmitted over a transmission antenna at a too long interval, the base station typically can not know accurately uplink channel status information of respective transmission antennas from the transmitted SRSs and consequently can not perform accurate channel estimation on the respective transmission antennas.

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